Definition of unshakable adjective from the Oxford Advanced Learner's Dictionary

 

unshakable

 adjective
(also unshakeable)adjective
BrE BrE//ʌnˈʃeɪkəbl//
 
; NAmE NAmE//ʌnˈʃeɪkəbl//
 
 
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(of a feeling or an attitude) that cannot be changed or destroyed synonym firm unshakable loyalty She has an unshakable belief in the goodness of humanity. They have an unshakable conviction that what they are doing is right.
See the Oxford Advanced American Dictionary entry: unshakable